from flask import Flask, render_template, session, redirect, url_for, flash
from flask_bootstrap import Bootstrap
from flask_moment import Moment
from datetime import datetime
from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField
from wtforms.validators import DataRequired
import os
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate

basedir = os.path.abspath(os.path.dirname(__file__))
app = Flask(__name__)
app.config["SECRET_KEY"] = "leo_key_tmp"
bootstrap = Bootstrap(app)
moment = Moment(app)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///" + os.path.join(basedir, "data.sqlite")
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
db = SQLAlchemy(app)
migrate = Migrate(app, db)

class NameForm(FlaskForm):
    name = StringField("你的名字？", validators=[DataRequired()])
    submit = SubmitField("提交")

class Role(db.Model):
    __tablename__ = "roles"
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(64), unique=True)
    users = db.relationship("User", backref="role")
    
    def __repr__(self):
        return "<Role %r>" % self.name

class User(db.Model):
    __tablename__ = "users"
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), unique=True, index=True)
    role_id = db.Column(db.Integer, db.ForeignKey("roles.id"))

    def __repr__(self):
        return "<User %r>" % self.username

@app.shell_context_processor
def make_shell_context():
    return dict(db=db, User=User, Role=Role)

@app.route("/", methods=["GET", "POST"])
def index():
    # name = None
    form = NameForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.name.data).first()
        if user is None:
            user = User(username=form.name.data)
            db.session.add(user)
            db.session.commit()
            session["known"] = False
        else:
            session["known"] = True
        # name = form.name.data
        # form.name.data = ""
        old_name = session.get("name")
        if old_name is not None and old_name != form.name.data:
            flash("你刚更改了名字！")
        session["name"] = form.name.data
        return redirect(url_for("index"))
    # return render_template("index.html", current_time=datetime.utcnow(), form=form, name=name)
    return render_template(
        "index.html", current_time=datetime.utcnow(), form=form,
        name=session.get("name"), known=session.get("known", False))

@app.route("/user/<name>")
def user(name):
    return render_template("user.html", name=name)

@app.errorhandler(404)
def page_not_found(e):
    return render_template("404.html")

if __name__ == "__main__":
    app.run(debug=True)